Building block



FIG. 1 is a perspective view of a building block;

FIG. 2 is a front elevation thereof;

FIG. 3 is a rear elevation thereof;

FIG. 4 is a left side elevation thereof;

FIG. 5 is a right side elevation thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom view thereof; and

FIG. 8 is showing a front elevation view of a building block in aposition of use.

FIG. 9 is showing another embodiment of a building block in a positionof use.

FIG. 10 is showing the other embodiment of a building block in aposition of use.

FIG. 11 is showing the other embodiment of a building block in aposition of use.

FIG. 12 is showing the other embodiment of a building block in aposition of use.

FIG. 13 is showing the other embodiment of a building block in aposition of use.

FIG. 14 is showing the other embodiment of a building block in aposition of use.

FIG. 15 is showing the other embodiment of a building block in aposition of use.

FIG. 16 is showing the other embodiment of a building block in aposition of use.

FIG. 17 is showing the other embodiment of a building block in aposition of use.

FIG. 18 is showing the other embodiment of a building block in aposition of use; and,

FIG. 19 is showing the other embodiment of a building block in aposition of use.

The ornamental design for a building block, as shown and described.